Method for transmission and configuration of ranging channel in accordance with a variety of frame structures in radio communication system

Abstract

The present invention relates to configuration procedures and transmission of a ranging channel for a synchronization of an uplink of user equipment and a relay station in a communication system which supports a relay, in that the configuration of the ranging channel for acquiring an uplink synchronization may vary in accordance with a variety of frame structures, thereby reducing uplink interferences and performing an uplink synchronization in a stable and quick manner.

The invention claimed is: 
     
       1. A method for ranging through ranging channels configured according to a frame structure in a radio communication system which supports a relay station (RS), the method comprising:
 configuring the ranging channels for a communication with the RS, the ranging channels including a first ranging channel located in an uplink subframe of a base station (BS) frame, a second ranging channel located in the uplink subframe of the BS frame, a third ranging channel located in an even-hop RS frame, and a fourth ranging channel located in an odd-hop RS frame; and 
 performing ranging procedures between a BS and a mobile station (MS) and/or a subordinate RS through the configured ranging channels, 
 wherein the third ranging channel has same position and size as the first ranging channel, and the fourth ranging channel has same position and size as the second ranging channel, when the RS is in a transparent relay mode, and 
 wherein the third ranging channel has different position and size from the first ranging channel, and the fourth ranging channel has different position and size from the second ranging channel, when the RS is in a non-transparent relay mode. 
 
     
     
       2. The method of  claim 1 , further comprising transmitting, by the MS, a ranging signal through the configured ranging channels to the BS or the RS. 
     
     
       3. The method of  claim 1 , wherein the first ranging channel is used to perform an initial ranging, a periodic ranging, and handover between the BS and the MS directly connected to the BS, and to perform a periodic ranging and a handover between the BS and the RS. 
     
     
       4. The method of  claim 1 , wherein the second ranging channel is used to perform periodic ranging, and random access for handover between the BS and the RS directly connected to the BS. 
     
     
       5. The method of  claim 1 , wherein the third ranging channel provides the same function as the first ranging channel to a subordinate MS and a subordinate RS. 
     
     
       6. The method of  claim 1 , wherein the fourth ranging channel provides the same function as the second ranging channel to a subordinate MS and a subordinate RS. 
     
     
       7. The method of  claim 1 , wherein the frame structure is a uni-directional frame structure, or a bi-directional frame structure, or a uni-directional frame structure for coexistence with the transparent relay mode and the non-transparent relay mode. 
     
     
       8. The method of  claim 1 , wherein when the frame structure is a bi-directional frame structure, the third ranging channel is located at the odd-hop RS frame in the transparent relay mode, and has different positions and sizes in the even-hop RS frame and the odd-hop RS frame in the non-transparent relay mode. 
     
     
       9. The method of  claim 1 , wherein when the frame structure is a bi-directional frame structure, the fourth ranging channel is configured for uplink synchronization of the subordinate RS in each bi-directional receive zone of an odd-hop RS and an even-hop RS. 
     
     
       10. The method of  claim 1 , wherein information on a position and a size of each ranging channel is indicated by a downlink broadcast channel of the BS or a superordinate RS, and is categorized according to time, a frequency, and a code. 
     
     
       11. A method for ranging through ranging channels in a radio communication system, the method comprising:
 setting the ranging channels with a base station (BS) and a relay station (RS) in a division manner; and 
 performing ranging procedures through the ranging channels by a mobile station (MS), 
 wherein the ranging channels are established by reserving a ranging code, or by dividing a specific ranging time or frequency resource, 
 wherein the ranging channels include a first ranging channel located in an uplink subframe of a BS frame, a second ranging channel located in the uplink subframe of the BS frame, a third ranging channel located in an even-hop RS frame, and a fourth ranging channel located in an odd-hop RS frame, 
 wherein the third ranging channel has same position and size as the first ranging channel, and the fourth ranging channel has same position and size as the second ranging channel, when the RS is in a transparent relay mode, and 
 wherein the third ranging channel has different position and size from the first ranging channel, and the fourth ranging channel has different position and size from the second ranging channel, when the RS is in a non-transparent relay mode. 
 
     
     
       12. A method for ranging through ranging channels in a radio communication system, the method comprising:
 transmitting an initial ranging code between a base station (BS) and a relay station (RS), and receiving, by the BS, a ranging code measured by the RS; 
 receiving, by the BS, ranging information from the RS in response to a request; and 
 performing, by a mobile station (MS), ranging procedures through ranging channels for uplink synchronization to the BS or the RS, based on the ranging information received from the BS, 
 wherein the ranging channels include a first ranging channel located in an uplink subframe of a BS frame, a second ranging channel located in the uplink subframe of the BS frame, a third ranging channel located in an even-hop RS frame, and a fourth ranging channel located in an odd-hop RS frame, 
 wherein the third ranging channel has same position and size as the first ranging channel, and the fourth ranging channel has same position and size as the second ranging channel, when the RS is in a transparent relay mode, and 
 wherein the third ranging channel has different position and size from the first ranging channel, and the fourth ranging channel has different position and size from the second ranging channel, when the RS is in a non-transparent relay mode. 
 
     
     
       13. The method of  claim 12 , wherein the ranging channels are implemented for uplink synchronization setting between the BS and the RS, and are supported with a common initial ranging, or
 wherein the ranging channels are established by reserving a ranging code, or by dividing a specific ranging time and/or frequency resource.